linux-ext4 - [Bug 89511] USB-storage mount error

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Date:	Fri, 19 Dec 2014 22:11:49 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 89511] USB-storage mount error

https://bugzilla.kernel.org/show_bug.cgi?id=89511

--- Comment #19 from Alan Stern <stern@...land.harvard.edu> ---
Now I see the problem.  Your drive doesn't like the SYNCHRONIZE CACHE command;
it responds with an error "Illegal request, invalid operation code".  It does
this even though it claims to have a write cache and therefore to support
SYNCHRONIZE CACHE.

In short, the bug is in the drive or in its USB interface.  You may be able to
work around the bug by doing this before you mount it:

   echo 'temporary write through' >/sys/block/sdb/device/scsi_disk/*/cache_type

I don't know if that command will work with your kernel (it should work with
3.10 or later).  If it doesn't, try leaving out the word "temporary":

   echo 'write through' >/sys/block/sdb/device/scsi_disk/*/cache_type

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